How to Blur Part of a Video (Free, Online)
November 3, 2026
Short answerOpen your video in a browser-based editor like Blur The Video, drag a box over the area you want hidden, and set the box's start and end time so it only covers the seconds you need. Then export.
"Part of a video" can mean two things: a part of the frame (one corner, a face, a sign) or a part of the timeline (only the ten seconds where someone's address is visible). Most of the time you need both. This guide shows how to do it for free in your browser, without installing anything or uploading the file anywhere.
Step by step
- Open the free video blur editor and drop in your video (MP4, MOV or WebM). The file is read locally, so nothing is uploaded.
- Play or scrub to the moment where the thing you want to hide first appears.
- Drag on the video to draw a box over it. Move the box or pull its handles until it covers the area with a little margin.
- Pick the effect: Blur, Pixelate or Solid (an opaque block). For blur and pixelate, raise the strength slider until the content is unreadable.
- Click Start here to make the box begin at the current playhead. Move to the moment the content disappears and click End here. You can also type exact seconds.
- Repeat for every other area. Each box keeps its own timing, so one can run for the whole clip while another covers just two seconds.
- Optionally set a trim range if you only want to export a section of the video.
- Export. Choose MP4 if your browser offers it, otherwise WebM.
Tips that save time
- Start a little early, end a little late. Half a second of padding on both sides is cheap insurance against a frame slipping through.
- Duplicate boxes (Cmd/Ctrl + D) when you need the same size and effect again later in the clip, then just change its timing.
- Mix effects in one video. A pixelated face, a blurred background screen and a solid block over an ID number can all sit in the same clip.
- Use the arrow keys to step through the video one second at a time (Shift for five) while checking the edges of a box's time range.
- Save the project file if you need to stop halfway. Load the same video again later, then load the project to get your boxes back.
- Undo and redo work as usual (Cmd/Ctrl + Z, Shift + Cmd/Ctrl + Z) if you move a box by accident.
What to watch out for
Boxes stay where you put them. The editor does not track movement automatically, so if the thing you are hiding moves, you either draw one larger box that covers its whole path, or split it into several shorter boxes. The guide on blurring a moving object covers that workflow in detail.
Export runs in real time: the editor plays the selected range and records it, so a three-minute clip takes roughly three minutes (less if you sped parts of it up). Keep the tab open and in the foreground until it finishes.
The free export adds a small watermark. You can remove it for one video for $0.99 or for every video with a $19.99 lifetime license. There is no subscription.
FAQ
Can I blur something for only a few seconds? Yes. Every blur box has its own start and end time. Set them with the Start here and End here buttons or type the seconds directly.
Can I blur several different areas at once? Yes. Draw as many boxes as you need. Each one can use a different effect, strength and time range.
Do I need to upload my video? No. Blur The Video runs in your browser and processes the file on your own device. It is never sent to a server.
Is it free? Exporting is free with a small watermark. Removing the watermark costs $0.99 for one video or $19.99 once for unlimited videos.